This is a Public SAP FTP site and here are the links to major SAP Trial version softwares.
SAP GUI 7.10 for Windows
Patches

SAP GUI 6.40 for Windows
Patches

SAP Netweaver 7.0 ABAP Trial Version Part 1
SAP Netweaver 7.0 ABAP Trial Version Part 2

SAP Netweaver 2004 Java Part 1
SAP Netweaver 2004 Java Part 2
SAP Netweaver 2004 Java Part 3

Now, after you download it here is a how to guides on installing NetWeaver and getting the license key from SAP.
How to Install SAP Netweaver 2004s ABAP Edition on Your Local PC
How to get a license key for SAP Netweaver 2004s ABAP Edition

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